package wn.lizzy.springboot.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

/**
 * 使用注解标注过滤器

 * @WebFilter将一个实现了javax.servlet.Filter接口的类定义为过滤器

 * 属性filterName声明过滤器的名称,可选

 * 属性urlPatterns指定要过滤 的URL模式,也可使用属性value来声明.(指定要过滤的URL模式是必选属性)
 * MyFilter.java
 * @author cuilj  2017年3月7日--上午10:22:25
 *
 */
@WebFilter(filterName="myFilter",urlPatterns="/*")
public class MyFilter implements Filter{
	@Override
	public void init(FilterConfig config) throws ServletException {
		System.out.println("过滤器初始化");
	}
	
	@Override
	public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException,ServletException {
		System.out.println("执行过滤操作");
		chain.doFilter(request, response);
	}
	
	@Override
	public void destroy() {
		System.out.println("过滤器销毁");
	}
}